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Gluon Saturation: a New Regime of QCD.The important measurements are described under exclusive reactions.incoherent: nucleus breaks up, but nucleons stay intactīelow is a list of measurements from the EIC WP are that use diffractive events.These events are indicative of a color neutral exchange in the t-channel between the virtual photon and the proton over several units in rapidity. Hard diffractive events, e(k) + N(p) → e′(k′) + N(p′) + X, are events where the proton/nucleus remains intact and the highly virtual photon fragments into a final state, X, that is separated from the scattered proton/nucleus by a large rapidity gap without any particles. EIC WP chapter 2.4.2ĭetails of the kinematics of the final state and the forward scattered proton and nuclei in coincidence with the scattered lepton can be found here Detector Design Requirements following from exclusive DISĭetails of the requirements imposed on detector performance can be found here Performance Studies for exclusive DIS Production of j/ψ decaying into leptons: e + p → e' + p' + j/ψ, j/ψ → e + + e.Deeply Virtual Compton Scattering (DVCS): e + p → e' + p' + γ.Spatial Imaging of Quarks and Gluons EIC WP chapter 2.4 (pages 44-58).The accelerator and detector requirements are discussed on the EIC WP chapter 2.4.4īelow is a list of measurements from the EIC WP are that rely only on the reconstruction of the entire final state. The reconstruction of the produced particle, such as a photon or a vector meson decaying into leptons, imposes extra detector requirements, mainly on tracking and calorimetry. EIC WP chapter 3.3.2 (pages 90-93).ĭetails of the kinematics of the hadronic final state in coincidence with the scattered lepton can be found here Detector Design Requirements following from semi-inclusive DISĭetails of the requirements imposed on detector performance can be found here Performance Studies for semi-inclusive DISĮxclusive DIS describes measurements that involve the measurement of the scattered lepton, the scattered proton (either intact or dissociated into a hadronic final state) and the reconstruction of the final particle produced in the interaction.įor low-x events the proton scatters at such a small angle that very often it escapes the main detector through the beam pipe hole, and its measurement requires forward detectors ("Roman Pots") installed along the beam pipe.

Hadronisation and energy loss during the propagation of a fast-moving color charge in QCD matter.Transverse-momentum-dependent gluon distributions and gluon saturation in nuclei, via di-hadron correlations.Investigate SU(3) flavour symmetry breaking, via (anti-)strange distributions.Transverse-momentum-dependent parton distributions.

Flavour-separated polarized (anti-)quark parton distributions.

References are given to the relevant sections of the EIC white paper (WP) for further details. The following is a list of measurements that rely on the measurement of a hadron or hadrons in addition to the scattered lepton. A measured hadron is typically characterised by its transverse momentum, p T, with respect to the virtual photon (not the incident beams) and its energy fraction, z see the section on kinematics for further details and definitions. However further requirements are posed by the need to detect the final state hadron(s). A schematic view of a SIDIS event is shown in the figure.Īll the requirements for detection of the scattered lepton apply in SIDIS as for inclusive reactions. Semi-inclusive DIS (SIDIS) involves measuring one or more (in the case of correlation measurements) final-state particles in addition to the detection of the scattered lepton.

Gluon saturation through nuclear structure functions EIC WP chapter 3.2.1 (pages 71+), chapter 3.2.2 (page 78) and chapter 3.3 / 3.3.1 (pages 87+)ĭetails of the scattered lepton kinematics can be found here Detector Design Requirements following from inclusive DISĭetails of the requirements imposed on detector performance can be found here Performance Studies for inclusive DIS.

The Longitudinal Spin of the Nucleon EIC WP chapter 2.1 (pages 14-32).

These measurements are based on the polarised spin structure function g 1 and the unpolarised structure functions F 2 and F L. The requirements for detecting the scattered lepton are critical, and remain the same for semi-inclusive, exclusive and diffractive reactions, as the scattered lepton defines the parton kinematics (through x and Q 2) for all reaction types.īelow is a list of measurements from the EIC WP are that rely only on the measurement of the scattered lepton. Inclusive DIS refers to measurements that involve only the scattered lepton.